J Interdiscip Dentistry
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Year : 2021  |  Volume : 11  |  Issue : 3  |  Page : 114-118

Evaluation of bonding strength of conventional glass ionomer cement modified with micro- and nano-hydroxyapatite: An in vitro study

Department of Conservative Dentistry and Endodontics, CSMSS Dental College and Hospital, Aurangabad, Maharashtra, India

Correspondence Address:
Dr. Karishma Kishor Patel
At Post Pandhari, Khanampur, Tq-Anjangaon Surji, Amravati - 444 808, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jid.jid_76_20

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Context: With the dawn of esthetic dentistry, esthetic restorative materials are the preferred choice for various applications. Because of their limited strength and wear resistance, glass ionomer cement (GIC) is indicated generally for the restoration of low-stress areas where caries activity potential is of significant concern. Therefore, hydroxyapatite (HA) materials were added to improve the consistency, compressive, and bonding strength of GIC. In dentistry, the adhering ability of GIC to HA resulted in variety of clinical applications. Aims: The aim of this study is to evaluate and compare the effects of incorporation of micro-HA and nano-HA on the bonding strength of conventional GIC to tooth structure. Settings and Design: There was an experimental randomized analytical in vitro study. Materials and Methods: Twenty-one extracted human permanent molars were divided into three groups (n = 7). Each specimen was buried in a cylinder-shaped epoxy resin, and coronal portion was sectioned to expose the dentin surface available for bonding GIC. The smear layer on the exposed dentin was removed by etching with 35% phosphoric acid. Mixed cement was placed on tooth in cylindrical form, and specimens were immersed in artificial saliva for 4 weeks. After 4 weeks, shear bond strength was measured using a universal testing machine with 1 mm/min crosshead speed. Statistical Analysis Used: Obtained shear bond strength values were statistically analyzed using one-way ANOVA and Tukey's Post hoc test. Results: Results showed that there are significant differences between GIC reinforced with HA than conventional GIC. The bonding strength is higher in nano-HA GIC compared to micro-HA and conventional GICs. Conclusions: The addition of 15% HA to conventional GIC increased its bond strength to dentin. Nano-HA added GIC showed the highest bonding strength to tooth structure.

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